EPA UCMR 5 results for 5 public water systems. 3 had at least one PFAS detected; 1 had a highest single PFOA or PFOS result above 4.0 ppt.
UCMR 5 is a one-time EPA monitoring program, not a compliance determination. The values shown are the highest single sample result at any of the system's sampling points; one result above 4.0 ppt does not mean the system violates the PFAS rule, which is judged on running annual averages under separate compliance monitoring. Results describe the public water system, not an individual home.
| Water system | Serves | PFOA max (ppt) | PFOS max (ppt) | PFAS detected |
|---|---|---|---|---|
| Andersen Air Force Base Water System GU0000009 | Guam County | ND | ND | 3 |
| Gwa Central Water System GU0000003 | Adelup, Agana Heights, Agat and others | ND | ND | 0 |
| Gwa Northern Water System GU0000006 | Adacao, Adelup, Agana Heights and others | 18.3 | 135 | 11 |
| Gwa Southern Water System GU0000001 | Talofofo, Unatac | ND | ND | 0 |
| U.S. Navy Water System GU0000010 | Apra Heights, Guam Naval Facility, Guam Naval Magazine and others | ND | ND | 1 |
ND = not detected (below the 4 ppt UCMR 5 reporting level). Values are the highest single sample result, not an annual average.